SP | Impeller Running Clearance | Shaft & Bearing Replacement
IMPELLER RUNNING CLEARANCE
The impeller running clearance, the distance
between the impeller vanes and wear plate, is
adjusted at the factory prior to shipment to
.020"-.030". To adjust this clearance in the field,
shut down the pump, disconnect power supply to
the pump and use the following instructions.
1. Drain pump casing completely by removing
drain plugs from both suction and discharge
chamber.
2. Remove clean-out cover by unscrewing the two
hand knobs.
3. Reach inside the pump casing through the
cleanout hole with a feeler gage and measure
the gap between the impeller vanes and wear
plate. Measure this gap at each impeller vane.
If this gap is not within the allowable limits of
.020"-.030", adjust this clearance as follows:
a. Unscrew the three jackscrews and jam nuts.
Partially loosen the bearing carrier caps
crews.
b. Adjust the jackscrews and cap screws until
the front clearance between the impeller
vanes and wear plate falls within the
allowable range of .020"-.030". Tightening
the jackscrews will increase the front
clearance and tightening the cap screws will
decrease the front clearance. Tighten one
set of screws and loosen the other to go in
the direction required. Tighten locknut.
Note: Maximum allowable bearing carrier (110)
pull back movement is 1/8", (i.e. from the
condition when impeller is "just" touching the wear
plate you can push back the bearing carrier
assembly by 3.2mm.
SHAFT AND BEARING REPLACEMENT
If shaft or bearing replacement is necessary, follow
these instructions. (Shut down the pump and
disconnect power supply to the pump before
working on pump.)
1. Install the front (impeller end) bearing on the
shaft.
2. Slide the carrier retaining ring onto the shaft.
3. Install the rear (coupling end) bearing on the
shaft.
4. Install the retaining ring onto the shaft (38).
Add shims (107) between the retaining ring
and the bearing if required to lock the bearing
on to the shaft axially.
5. Install O-ring into the bearing carrier groove.
6. Slide the bearing carrier with O-ring over the
rear bearing such that rear bearing slides into
the bearing carrier. Install the retaining ring
(106) in place.
7. Insert shaft assembly with bearings and carrier
into the housing.
CLEANING OR REPLACING CHECK VALVE
(Shut down the pump and disconnect power
supply to the pump before working on the pump.)
Drain pump casing completely by removing drain
plugs. Access to suction check valve can be made
by removing the check valve cover plate from the
top of the suction chamber of pump casing.
Reaching through the check valve cover plate hole,
remove the two shoulder screws and check valve
keeper plate. Now slide off check valve. Pull the
check valve assembly out of the pump casing
through the cover plate hole. Inspect the sealing
surface of the check valve and make sure it is in
good condition and free of debris.
CLEANING IMPELLER
Drain pump casing completely by removing drain
plugs. Remove hand knobs, remove clean-out cover
and using coat hanger, remove debris from the
impeller eye area and if necessary wash it off with
garden hose. Check O-ring on the clean-out cover
replace it if necessary.
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